Congenital heart disease (CHD) is one of the leading causes of childhood disability and mortality worldwide. The searching for predictors involved in the CHD pathogenesis including various genes encoding the folate-metabolizing enzymes is a very urgent task for modern biomedicines.
AIM
To study the associations between polymorphism in the MTHFR (C677T), MTHFR (A1298C), MTR (A2756G) and MTRR (A66G) genes and CHD risk.
MATERIAL AND METHODS
179 females having children with CHD (case group) and 103 females having two and more healthy children (control group) were included in the presented study. Genotyping of polymorphic variants in the MTHFR (C677T), MTHFR (A1298C), MTR (A2756G) and MTRR (A66G) genes was performed using real-time PCR. Gene-gene interaction was studied by MDR (Multifactor dimensionality reduction) method.
RESULTS
Two statistically significant models of gene-gene interactions associated with CHD risk were identified. Model A is represented by a combination of two polymorphic variants in the MTHFR (C677T) and MTRR (A66G) genes. Model B is characterized by a combination of all studied polymorphic variants. For both models no significant protective combinations of female genotypes of the studied genes in relation to CHD risk in the next generation were found.
CONCLUSION
The study showed that CHD without chromosomal abnormalities is associated with the combined genotype MTHFR (C677T)*C/T — MTRR (A66G)*A/G; OR 2.15 (95% CI 1.75; 4.96), p=0.01. Moreover, polymorphic variants in the MTHFR (C677T) and MTRR (A66G) genes have a synergistic effect towards sporadic CHD risk in the next generation, while the MTHFR (A1298C) and MTR (A2756G) genes have an antagonistic effect.